Alright, let's work through 80203931 times 89395499 step by step
80203931 × 89395499 = 89395499 × (80203931)
+ 89395499 × 1 which equals 89395499
+ 89395499 × 30 that results in 2681864970
+ 89395499 × 900 giving us 80455949100
+ 89395499 × 3000 which equals 268186497000
+ 89395499 × 00000 yielding 0
+ 89395499 × 200000 what gives us 17879099800000
+ 89395499 × 0000000 that equals 0
+ 89395499 × 80000000 resulting in 7151639920000000

= 7169870433506569
